vb 2008 sortedlist within a structure

"Object reference not set to an instance of an object" is the error I receive. Usually I declare these with the NEW qualifier, but that was not allowed in a structure.

 Private Structure slArray
        Dim ProviderandCases As SortedList
        Dim ProviderandCharges As SortedList
        Dim PayerPrimaryandCharges As SortedList
        Dim PayerPrimaryandCases As SortedList
        Dim MDandNonMDCharges As SortedList
        Dim MDandNonMDCases As SortedList
        Dim MDandNonMDMedicareFFS01Charges As SortedList
        Dim MDandNonMDMedicareFFS01Cases As SortedList
    End Structure
    Private slTotalsTable(13) As slArray   ' 0 will be Totals, 1- 12 will be months

' this is in a subroutine
            For ii As Integer = 0 To 12
                slTotalsTable(ii).ProviderandCases.Clear()
                slTotalsTable(ii).ProviderandCharges.Clear()
                slTotalsTable(ii).PayerPrimaryandCharges.Clear()
                slTotalsTable(ii).PayerPrimaryandCases.Clear()
                slTotalsTable(ii).MDandNonMDCharges.Clear()
                slTotalsTable(ii).MDandNonMDCases.Clear()
                slTotalsTable(ii).MDandNonMDMedicareFFS01Charges.Clear()
                slTotalsTable(ii).MDandNonMDMedicareFFS01Cases.Clear()
            Next

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